Separation of Indigo Naturalis by foam flotation technique in a continuous mode / 中草药

Objective To study the process of foam flotation in separation of Indigo Naturalis in a continuous mode and to optimize the operational conditions.Methods Taking content and rate of recovery rate of indigo as index to investigate the single factors,such as the height of collecting region,the height of froth layer,flushing water rate,delivery rate,air flow rate,and aerating velocity,to study the effect of continuous foam floatation on Indigo Naturalis,and to optimize the process conditions finally.Results The flotation performance is good when the height of collecting region is 1.5 m,the height of froth layer is 30 cm,the delivery rate is 0.1 cm/s,the flushing water rate is 0.01 cm/s,the aerating velocity is 1.5 cm/s.The recovery rate of indigo is more than 75% and indgo content is over 5.0%.Conclusion Foam flotation technique is stable and can be used to the separation of Indigo Naturalis in a continuous mode.And this study is the foundation of semi-works production of Indigo Naturalis.

An initial study on the mechanism of Indigo Raturalis by foam floatation technique / 中成药

AIM:To study the mechanism of foam floatation in the processing of Indigo Raturalis,and provide theory to support the industrialization of Indigo Raturalis processing by foam fioatation technique. METHODS: To study the critical problems of the processing of Indigo Raturalis by foam floatation technique: the change of particle size distribution after the processing of Indigo Raturalis;The surface activity of frothing materials in Indigo Raturalis;the distinction of the foam to absorb the Indigo particles and other particles(CaCO_3);the absorbability of the Indigo particles to absorb different surface active agents. RESULTS: 1.The Indigo particles were easily absorbed by the foam,but others(CaCO_3) were not;2.There were some frothing materials with good frothing capability in the alkaline system of Indigo Raturalis,3 In the alkaline system,the Indigo particles could be absorbed by the foam of strong acid surface active agents. CONCLUSION: In the alkaline system of Indigo Raturalis,with itself surface active agents,it is effective to process Indigo Raturalis by foam floatation technique.

Indigo Naturalis separation by foam floatation / 中成药

AIM: To study the process of foam floatation in the separation of Indigo Naturalis in batch mode. METHODS: Recovery of indigo and purity were chosen as the performance criteria and single examining method to examine the operational parameters,i.e.air flow rate,initial feed concentration,solution pH,initial feed volume on floatation performance. RESULTS: The floatation performance was good when gas flow rate increased from 112 L/h to 256 L/h,initial feed concentration of 0.4 g/mL,keeping the initial pH,feed volume of 1 000 mL.The purity ratio of indigo was about 2.3 and the recovery was about 90%. CONCLUSION: Foam(floatation) can be applied to the separation of Indigo Naturalis.